Zero Voltage Vector - Based Predictive Direct Torque Control for PMSM

In this paper, we proposed a zero voltage vector-based PDTC-PWM (Predictive Direct Torque Control - Pulse Width Modulation) control method of PMSM. DTC selects the voltage vectors from the flux and torque errors. However, these vectors may not satisfy both torque response and motor speed requirements due to back EMF and decoupling effects. Therefore, back EMF and decoupling components should be considered in the voltage vector selection to improve the control performance of PMSM. The proposed zero voltage vector - based PDTC-PWM predicts the flux and torque of the next sample. It is then used to calculate the output voltage vector and the optimal PWM duty ratio based on the error value between the command value and the predicted value of the flux and torque. Simulation results show that the proposed zero voltage vector based - PDTC-PWM control method for PMSM provides excellent control performance with low torque ripple.